17,5 km Anding Tunnel with the most complex geological conditions and most difficult construction on the China-Laos-Kunming-Wanzhou Railway finish September 30.

Xinhuanet report on July 26, two inclined shafts (2-1 and 2-2 inclined) are connected.Anding Tunnel is on collision zone of Indian Ocean plate and the Eurasian plate. It crosses the Ailao Mountain and has complex geological conditions.

Anding Tunnel is a very high-risk tunnel with 21 faults on its way. Mainly IV and V grade soft rock. The China Railway Fifth Bureau is responsible for construction.

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